NCCER Electrical Level 3, Mod 2 Exam
Questions and Answers
what color is reserved for the hi-leg on 3-phase, 4 wire, delta system? - Answer-orange
how much of a correction factor is needed for the ambient temperature of 40ºC? -
Answer-0.82 NEC 310.15 (B)(2)(A)
the most common conductors used for light and power installations range from -
Answer-4/0 - 14 AWG
what must be determined in considering the size of the conductor required to connect
an electrical load to the source of supply? - Answer-permissable voltage drop
what is an acceptable method of identification for grounded conductors larger than NO.
6 AWG? - Answer-white or grey
physical properties of a 4/0 copper conductor found in? - Answer-CH9, Table 8
what type of wire is least flexible? - Answer-solid
a conductor has a diameter of 40 mils? what is the diameter in inches? - Answer-.04"
square mil area of a conductor that is .250" - Answer-62500 square mils
what is total resistance of a 2 wire circuit that spands a distance of 200' each way if the
resistance Per 1000' is 1.21 ohms? - Answer-.0484 ohms
max voltage drop that you can have on a 277v circuit with the max voltage drop allowed
is 3%? - Answer-8.3 volts
normal location to provide over-current protection is? - Answer-where conductor
receives supply
correction factor needed if ambient temp is above? - Answer-86ºF
3 or more wires? - Answer-80%
correction factors found? - Answer-310.15 (B)(2) (A and B)
grounded conductor? - Answer-white or grey
purpose of compact conductors? - Answer-reduce overall diameter of cable
Questions and Answers
what color is reserved for the hi-leg on 3-phase, 4 wire, delta system? - Answer-orange
how much of a correction factor is needed for the ambient temperature of 40ºC? -
Answer-0.82 NEC 310.15 (B)(2)(A)
the most common conductors used for light and power installations range from -
Answer-4/0 - 14 AWG
what must be determined in considering the size of the conductor required to connect
an electrical load to the source of supply? - Answer-permissable voltage drop
what is an acceptable method of identification for grounded conductors larger than NO.
6 AWG? - Answer-white or grey
physical properties of a 4/0 copper conductor found in? - Answer-CH9, Table 8
what type of wire is least flexible? - Answer-solid
a conductor has a diameter of 40 mils? what is the diameter in inches? - Answer-.04"
square mil area of a conductor that is .250" - Answer-62500 square mils
what is total resistance of a 2 wire circuit that spands a distance of 200' each way if the
resistance Per 1000' is 1.21 ohms? - Answer-.0484 ohms
max voltage drop that you can have on a 277v circuit with the max voltage drop allowed
is 3%? - Answer-8.3 volts
normal location to provide over-current protection is? - Answer-where conductor
receives supply
correction factor needed if ambient temp is above? - Answer-86ºF
3 or more wires? - Answer-80%
correction factors found? - Answer-310.15 (B)(2) (A and B)
grounded conductor? - Answer-white or grey
purpose of compact conductors? - Answer-reduce overall diameter of cable
